Researchers have overcome a fundamental obstacle to realizing the full potential of quantum computing.They developed a method to protect quantum information while simultaneously performing calculations. When a quantum bit (qubit) interacts with the environment its quantum information is quickly destroyed. Until now, methods to decouple individual qubits from the environment isolated the qubits from each other so they could not exchange information. The scientists devised a scheme that seamlessly integrates decoupling from the environment into the quantum computation process. Excellent performance of this method was demonstrated for a hybrid logic device made of an electron qubit and a nucleus qubit in diamond, at room temperature. This development clears the way for the high-fidelity transfer, processing and retrieval of information that is critical for quantum information processing.
Decoherence-protected Quantum Gates for a Hybrid Solid-state Spin